Hello, Am 26.10.2018 um 14:05 schrieb Steffen Rose: > Hello, > > I want to test the fasted transmit speed of my socketcan. > > Attached my simple test. > > > I want to write message by message to socketcan without a break. > > I expect an error return value, if I cannot write, because the queue is > full. > > I count only correct written values. > > > On my system only 9772 messages from 10000 are transmitted. On a > different customer system only around 2700 messages are transmitted. > > Can you please check, if I have a mistake in my test program? > > Do you have an other idea? > > > I test on a classical CAN bus with a bitrate of 250kbit/s. > > The analyzer on a second device and also a test with a local candump > also connected to can0, show the same values. > > Which information are required? > > Which part of the socketcan software is related to this problem? > > > $ uname -a > Linux **** 4.15.0-36-generic #39-Ubuntu SMP Mon Sep 24 16:19:09 UTC 2018 > x86_64 x86_64 x86_64 GNU/Linux > > after some test: > > $ ip -details -statistics link show can0 > 4: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc fq_codel state UNKNOWN The problem is with that qdisc! This has been discussed recently: https://marc.info/?t=152785837700001&r=1&w=2 Wolfgang.
